Sand soil large-diameter pile foundation p-y curve correction method and system

Abstract

The present disclosure provides a sand soil large-diameter pile foundation P-Y curve correction method and system, the scheme comprises: dividing the sand soil foundation into several subsoil layers, obtaining the sand soil internal friction angle, soil effective gravity of each subsoil layer and vertical depth from the mud surface at the middle height of each subsoil layer based on geological exploration; based on the obtained internal friction angle and the expression in the API specification P-Y curve method, the correlation coefficient is calculated; based on the soil effective gravity, vertical depth and correlation coefficient, the standard value of the limit horizontal soil resistance of each subsoil layer per unit pile length is obtained; based on the load characteristics and the preset cycle number, the correction coefficient is determined, and the initial modulus of the foundation reaction force is calculated based on the internal friction angle; based on the limit horizontal soil resistance standard value, correction coefficient and initial modulus of foundation reaction force, the P-Y curve of each subsoil layer after correction is obtained; based on the obtained P-Y curve and the finite element simulation analysis software, the deformation analysis of the horizontal bearing pile is realized.

Description

Technical Field

[0001] This disclosure pertains to the fields of geotechnical engineering and offshore wind power equipment, and particularly relates to a method and system for correcting the PY curve of large-diameter pile foundations in sandy soil. Background Technology

[0002] The statements in this section are merely background information relating to this disclosure and do not necessarily constitute prior art.

[0003] Offshore wind turbines and towers are large in size and subject to the coupled effects of complex loads such as wind and waves, which places higher demands on the foundations supporting the wind turbine and tower structures. Common types of pile foundations for offshore wind turbines both domestically and internationally include ultra-large diameter monopile foundations, tripod foundations, jacket foundations, and pile group foundations, among which ultra-large diameter monopile foundations can reach a diameter of 5 to 9 meters.

[0004] The inventors discovered that current analyses of horizontally loaded pile foundations often employ the PY curve method recommended by the American Petroleum Institute (API) specifications (where P is the soil reaction force acting per unit length along the pile, and Y is the horizontal deflection of the pile). The PY curve method considers the nonlinear characteristics of the soil and can be used for large deformation analysis of horizontally loaded piles. While the PY curve can account for the interaction between the pile and soil and objectively reflect the bearing deformation characteristics of horizontally loaded piles, the API specification PY curve is based on test data of small-diameter piles with a diameter less than 1.5m under a finite number of cycles. It cannot reflect the stress characteristics of large-diameter pile foundations under external environmental loads, therefore, appropriate modifications to the PY curve for large-diameter pile foundations are necessary.

[0005] Meanwhile, proposing a reasonable PY curve for large-diameter pile foundations is of great significance for the design of marine pile foundations. For large-diameter pile foundations in sandy soil, the initial stiffness of the API specification PY curve is significantly larger when the pile body has small deformations. This leads to the horizontal displacement at the pile top calculated by the API specification PY curve method being significantly smaller than the actual situation, which will result in insecurity in the engineering design. Summary of the Invention

[0006] To address the aforementioned issues, this disclosure provides a method and system for correcting the PY curve of large-diameter pile foundations in sandy soil. The proposed solution effectively resolves the technical problem of poor reliability in calculating the horizontal deflection of large-diameter pile foundations in sandy soil by adjusting the initial modulus of the foundation reaction force and the correction coefficient under cyclic loading.

[0007] According to a first aspect of the present disclosure, a method for correcting the PY curve of large-diameter pile foundations in sandy soil is provided, comprising:

[0008] The sandy soil foundation is divided into several sub-soil layers. Based on geological exploration, the internal friction angle of the sand, the effective unit weight of the soil, and the vertical depth from the mud surface at the middle height of each sub-soil layer are obtained.

[0009] The first, second, and third coefficients are calculated based on the obtained internal friction angle and the expression in the API specification PY curve method.

[0010] Based on the effective unit weight of the soil, the first coefficient, the second coefficient, the third coefficient, and the vertical depth, the standard value of the ultimate horizontal soil resistance per unit pile length in each subdivided soil layer is obtained.

[0011] Based on the load characteristics and the preset number of cycles, a correction coefficient is determined, and the initial modulus of the foundation reaction force is calculated based on the internal friction angle.

[0012] Based on the standard value of ultimate horizontal soil resistance, correction coefficient, and initial modulus of foundation reaction, the corrected PY curves of each subdivided soil layer are obtained.

[0013] Based on the obtained PY curve and finite element simulation analysis software, deformation analysis of horizontal bearing piles is realized.

[0014] Furthermore, based on the load characteristics and the preset number of cycles, a correction coefficient is determined, wherein the correction coefficient A is specifically represented as follows:

[0015]

[0016] Where z is the vertical depth, D is the pile diameter, and N is the number of cycles.

[0017] Furthermore, based on the standard value of the ultimate horizontal soil resistance, the correction coefficient, and the initial modulus of the foundation reaction, the corrected PY curves for each subdivided soil layer are obtained, specifically using the following formula:

[0018]

[0019] Where A is the correction factor, p u n is the standard value of the ultimate horizontal soil resistance. h denoted as the initial modulus of the foundation reaction force, z as the vertical depth, D as the pile diameter, and y as the horizontal deflection of the pile at the calculation point at the current depth z.

[0020] Furthermore, the first, second, and third coefficients are calculated based on the obtained internal friction angle and the expression in the API specification PY curve method.

[0021] Furthermore, the initial modulus of the foundation reaction force calculated based on the internal friction angle is specifically calculated using the following formula:

[0022]

[0023] in, It is the internal friction angle.

[0024] Furthermore, based on the effective unit weight of the soil and the vertical depth, the standard value of the ultimate horizontal soil resistance per unit pile length in each subdivided soil layer is obtained, specifically using the following formula:

[0025] p u =min{(C1z+C2D)γz,C3Dγz}

[0026] Where C1 is the first coefficient, C2 is the second coefficient, C3 is the third coefficient, and γ is the effective density of land.

[0027] Furthermore, based on the obtained PY curve and finite element simulation analysis software, the deformation analysis of the horizontal bearing pile is realized. Specifically, based on the obtained PY curve, finite element analysis software is used to perform analysis to obtain the pile deflection at each depth after a horizontal load is applied to the pile top.

[0028] According to a second aspect of the present disclosure, a PY curve correction system for large-diameter pile foundations in sandy soil is provided, comprising:

[0029] The data acquisition unit is used to divide the sandy soil foundation into several sub-soil layers and obtain the internal friction angle of the sand, the effective unit weight of the soil, and the vertical depth from the mud surface at the middle height of each sub-soil layer based on geological exploration.

[0030] The coefficient calculation unit is used to calculate the first, second, and third coefficients based on the obtained internal friction angle and the expression in the API specification PY curve method.

[0031] The ultimate horizontal soil resistance standard value acquisition unit is used to obtain the ultimate horizontal soil resistance standard value per unit pile length in each subdivided soil layer based on the effective unit weight of the soil, the first coefficient, the second coefficient, the third coefficient, and the vertical depth.

[0032] The foundation reaction initial modulus calculation unit is used to determine the correction coefficient based on the load characteristics and the preset number of cycles, and to calculate the foundation reaction initial modulus based on the internal friction angle.

[0033] The PY curve calculation unit is used to obtain the corrected PY curves of each subdivided soil layer based on the standard value of the ultimate horizontal soil resistance, the correction coefficient, and the initial modulus of the foundation reaction.

[0034] The deformation analysis unit is used to perform deformation analysis on horizontal bearing piles based on the obtained PY curves and finite element simulation analysis software.

[0035] According to a third aspect of the present disclosure, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and running on the memory, wherein the processor executes the program to implement the described method for correcting the PY curve of large-diameter pile foundations in sandy soil.

[0036] According to a fourth aspect of the present disclosure, a non-transitory computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the described method for correcting the PY curve of a large-diameter pile foundation in sandy soil.

[0037] Compared with the prior art, the beneficial effects of this disclosure are:

[0038] (1) This disclosure provides a method and system for correcting the PY curve of large-diameter pile foundations in sandy soil. The scheme effectively solves the technical problem of poor reliability of the calculation results of the horizontal deflection of large-diameter pile foundations in sandy soil by adjusting the initial modulus of the foundation reaction force and the correction coefficient under cyclic load.

[0039] (2) The scheme described in this disclosure takes into account the influence of long-term cyclic loading on the accumulation of horizontal displacement and internal force changes of pile foundation by the API specification PY curve method, and considers the influence of size effect on the horizontal load analysis of large diameter pile foundation. It can more realistically represent the stress characteristics of large diameter pile foundation under long-term horizontal cyclic loading, and the method is simple to use and convenient for engineering calculation.

[0040] Advantages of this disclosure in additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0041] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure.

[0042] Figure 1 This is a schematic diagram of the PY curve method analysis described in the embodiments of this disclosure;

[0043] Figure 2 This is the horizontal load-displacement curve of the large-diameter pile foundation described in the embodiments of this disclosure;

[0044] Figure 3 This is a flowchart illustrating the calculation process of the correction algorithm described in the embodiments of this disclosure;

[0045] Figure 4 The initial foundation reaction modulus n as described in the embodiments of this disclosure h Angle of friction between sand and soil The fitted curve. Detailed Implementation

[0046] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

[0047] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0048] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0049] Where there is no conflict, the embodiments and features described herein can be combined with each other.

[0050] Example 1:

[0051] The purpose of this embodiment is to provide a method for correcting the PY curve of large-diameter pile foundations in sandy soil.

[0052] A method for correcting the PY curve of large-diameter pile foundations in sandy soil includes:

[0053] The sandy soil foundation is divided into several sub-soil layers. Based on geological exploration, the internal friction angle of the sand, the effective unit weight of the soil, and the vertical depth from the mud surface at the middle height of each sub-soil layer are obtained.

[0054] The first, second, and third coefficients are calculated based on the obtained internal friction angle and the expression in the API specification PY curve method.

[0055] Based on the effective unit weight of the soil, the first coefficient, the second coefficient, the third coefficient, and the vertical depth, the standard value of the ultimate horizontal soil resistance per unit pile length in each subdivided soil layer is obtained.

[0056] Based on the load characteristics and the preset number of cycles, a correction coefficient is determined, and the initial modulus of the foundation reaction force is calculated based on the internal friction angle.

[0057] Based on the standard value of ultimate horizontal soil resistance, correction coefficient, and initial modulus of foundation reaction, the corrected PY curves of each subdivided soil layer are obtained.

[0058] Based on the obtained PY curve and finite element simulation analysis software, deformation analysis of horizontal bearing piles is realized.

[0059] Furthermore, based on the load characteristics and the preset number of cycles, a correction coefficient is determined, wherein the correction coefficient is specifically represented as follows:

[0060]

[0061] Where z is the vertical depth, D is the pile diameter, and N is the number of cycles.

[0062] Furthermore, based on the standard value of the ultimate horizontal soil resistance, the correction coefficient, and the initial modulus of the foundation reaction, the corrected PY curves for each subdivided soil layer are obtained, specifically using the following formula:

[0063]

[0064] Where A is the correction factor, p u n is the standard value of the ultimate horizontal soil resistance. h denoted as the initial modulus of the foundation reaction force, z as the vertical depth, D as the pile diameter, and y as the horizontal deflection of the pile at the calculation point at the current depth z.

[0065] Furthermore, the first, second, and third coefficients are calculated based on the obtained internal friction angle and the expression in the API specification PY curve method.

[0066] Furthermore, the initial modulus of the foundation reaction force calculated based on the internal friction angle is specifically calculated using the following formula:

[0067]

[0068] in, It is the internal friction angle.

[0069] Furthermore, based on the effective unit weight of the soil and the vertical depth, the standard value of the ultimate horizontal soil resistance per unit pile length in each subdivided soil layer is obtained, specifically using the following formula:

[0070] p u =min{(C1z+C2D)γz,C3Dγz}

[0071] Where C1 is the first coefficient, C2 is the second coefficient, C3 is the third coefficient, and γ is the effective density of land.

[0072] Furthermore, based on the obtained PY curve and finite element simulation analysis software, the deformation analysis of the horizontal bearing pile is realized. Specifically, based on the obtained PY curve, finite element analysis software is used to perform analysis to obtain the pile deflection at each depth after a horizontal load is applied to the pile top.

[0073] Specifically, for ease of understanding, the following detailed description of the solution in this embodiment is provided in conjunction with the accompanying drawings:

[0074] This embodiment provides a method for correcting the PY curve of large-diameter pile foundations in sandy soil, by adjusting the initial modulus of the foundation reaction force n. h The correction factor A under cyclic loading is adjusted accordingly, which solves the technical problem of poor reliability of the calculation results of the horizontal deflection y of large-diameter pile foundations in sandy soil in the API specification PY curve method. The main technical concept is to adjust the calculation formula of the existing API specification PY curve method. The specific correction method is as follows.

[0075] (1) Initial modulus of foundation reaction n h The value should be multiplied by a correction factor after being obtained. y represents the horizontal deflection of the pile at the current depth z, and D represents the pile diameter.

[0076] (2) The correction factor A under long-term horizontal cyclic loading was changed from a fixed value of 0.9 to a calculated formula. N is the number of load cycles.

[0077] (3) According to the formula According to the internal friction angle Calculate the initial modulus n of the foundation reaction force h .

[0078] like Figure 1 As shown, the PY curve method assumes that the pile is a Winkler elastic foundation beam placed vertically in the soil. Unlike the elastic foundation reaction method, this method discretizes the soil into a series of independent nonlinear springs. That is, the magnitude of the soil reaction force p around the pile has a nonlinear relationship with the pile deflection y at that depth.

[0079] The API specification recommends the following expression for the PY curve method for pile foundations subjected to horizontal loads in sandy soil.

[0080]

[0081]

[0082]

[0083] p u =min{(C1z+C2D)γz,C3Dγz} (4)

[0084]

[0085]

[0086] In the above formula, p represents the soil resistance acting per unit length of the pile. u γ is the standard value of the ultimate horizontal soil resistance per unit pile length, y is the horizontal deflection of the pile, A is the correction factor considering load characteristics, z is the vertical depth of the current calculation point of the pile foundation from the mud surface, D is the pile foundation diameter, and γ is the effective unit weight of the soil. C1, C2, and C3 are the internal friction angles with the sand; C1, C2, and C3 are all internal friction angles with the sand. The correlation coefficient, in the formula n h The initial modulus of the foundation reaction force can be obtained by linear interpolation from Table 1.

[0087] Table 1 n h Value Reference Table

[0088]

[0089] like Figure 2 As shown, for large-diameter pile foundations, the initial stiffness of the API specification PY curve during small pile displacements is significantly larger than the actual situation. This results in a significantly smaller horizontal displacement at the pile top calculated using the API specification PY curve method, leading to insecurity in engineering design. Therefore, proposing a reasonable PY curve for large-diameter pile foundations is of great significance for the design of marine pile foundations.

[0090] Under the long-term action of low-frequency horizontal cyclic loads such as wind and waves, sandy soil will experience a weakening of cyclic stiffness, leading to a decrease in the bearing capacity of pile foundations and the accumulation of lateral displacements, which in severe cases can endanger the safety of offshore structures. This is because the PY curve method recommended by the API standard cannot consider the effect of pile diameter D on the initial soil reaction modulus n. h Furthermore, the correction coefficient A, which reflects the cyclic effect, cannot take into account the influence of factors such as the number of cycles and load characteristics, making it difficult to meet the analysis requirements for the accumulation of horizontal displacement and changes in internal forces of pile foundations under long-term cyclic loading.

[0091] To address the aforementioned technical issues, relevant technical literature was consulted, and a large amount of simulation and experimental data was collected, statistically analyzed, and regression analyzed. Ultimately, the improvement points of the solution described in this embodiment were determined. Specifically, the calculation formula for the PY curve method in the existing API specification was adjusted, and the specific correction method is as follows.

[0092] (1) Corrected initial modulus of foundation reaction n h . n in the above formula (1) h The value should be multiplied by a correction factor after being obtained. y represents the horizontal deflection of the pile at the calculation point at the current depth z, and D represents the pile diameter. This method considers the pile diameter D with respect to the initial ground reaction modulus n. hThe influence of size effect is considered in the horizontal load analysis of large-diameter pile foundations, which can more realistically represent the stress characteristics of large-diameter pile foundations under long-term horizontal cyclic loads.

[0093] (2) Adjust the correction factor A under cyclic loading. The new formula for A in formula (3) above is: N represents the number of load cycles, used to replace the original fixed value of 0.9. This correction method reflects the influence of the number of cycles N on the correction factor A of the cyclic effect, meeting the analysis requirements for the accumulation of horizontal displacement and changes in internal forces of pile foundations under long-term cyclic loading.

[0094] (3) According to the formula According to the internal friction angle Calculate the initial modulus n of the foundation reaction force h By fitting the discrete data points in Table 1, a more accurate value for n can be obtained. h The calculation formula allows for a faster calculation based on the internal friction angle. To obtain a more accurate n h value.

[0095] like Figure 3 As shown in the figure, this embodiment provides a method for correcting the PY curve of large-diameter pile foundations in sandy soil, which specifically includes the following steps:

[0096] Step S1: Divide the sandy soil foundation into several sub-soil layers, and obtain the internal friction angle of the sand in each sub-soil layer through geological exploration. The effective unit weight of the soil γ is used to manually calculate the vertical depth z from the mud surface at the middle height of each subdivided soil layer.

[0097] Step S2: Calculate the first coefficient C1, the second coefficient C2, and the third coefficient C3 according to the following formulas, where...

[0098]

[0099]

[0100]

[0101] Step S3: According to p u =min{(C1z+C2D)γz,C3Dγz} This formula is used to calculate the standard value of the ultimate horizontal soil resistance per unit pile length in each subdivided soil layer. u In the formula, D is the diameter of the pile foundation.

[0102] Step S4: Based on the load characteristics and the number of cycles N, determine the correction factor A according to the following formula. Under the long-term action of low-frequency horizontal cyclic loads such as wind and waves, a 25-year design life for marine structures generally corresponds to 10...7 After the second load cycle, the design life (L years) of other structures can be determined according to the formula. Calculate the number of load cycles.

[0103]

[0104] Step S5: According to the formula According to the internal friction angle Calculate the initial modulus n of the foundation reaction force h Then follow the formula Find the soil resistance function p = f(y) acting on a unit length of the pile in each subdivided soil layer, i.e., the PY curve of each subdivided soil layer.

[0105] In step S6, with the help of tools such as finite element simulation software, the pile deflection y at each depth after the horizontal load H is applied to the pile top can be obtained.

[0106] Example 2:

[0107] The purpose of this embodiment is to provide a PY curve correction system for large-diameter pile foundations in sandy soil.

[0108] A PY curve correction system for large-diameter pile foundations in sandy soil includes:

[0109] The data acquisition unit is used to divide the sandy soil foundation into several sub-soil layers and obtain the internal friction angle of the sand, the effective unit weight of the soil, and the vertical depth from the mud surface at the middle height of each sub-soil layer based on geological exploration.

[0110] The coefficient calculation unit is used to calculate the first, second, and third coefficients based on the obtained internal friction angle and the expression in the API specification PY curve method.

[0111] The ultimate horizontal soil resistance standard value acquisition unit is used to obtain the ultimate horizontal soil resistance standard value per unit pile length in each subdivided soil layer based on the effective unit weight of the soil, the first coefficient, the second coefficient, the third coefficient, and the vertical depth.

[0112] The foundation reaction initial modulus calculation unit is used to determine the correction coefficient based on the load characteristics and the preset number of cycles, and to calculate the foundation reaction initial modulus based on the internal friction angle.

[0113] The PY curve calculation unit is used to obtain the corrected PY curves of each subdivided soil layer based on the standard value of the ultimate horizontal soil resistance, the correction coefficient, and the initial modulus of the foundation reaction.

[0114] The deformation analysis unit is used to perform deformation analysis on horizontal bearing piles based on the obtained PY curves and finite element simulation analysis software.

[0115] Furthermore, the system described in this embodiment corresponds to the method described in Embodiment 1, and its technical details have been described in detail in Embodiment 1, so they will not be repeated here.

[0116] In further embodiments, the following is also provided:

[0117] An electronic device includes a memory and a processor, as well as computer instructions stored in the memory and running on the processor. When executed by the processor, the computer instructions perform the method described in Embodiment 1. For brevity, further details are omitted here.

[0118] It should be understood that in this embodiment, the processor can be a central processing unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc.

[0119] Memory may include read-only memory and random access memory, and provides instructions and data to the processor. A portion of memory may also include non-volatile random access memory. For example, memory may also store information about the device type.

[0120] A computer-readable storage medium for storing computer instructions, which, when executed by a processor, perform the method described in Embodiment 1.

[0121] The method in Embodiment 1 can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor. The software modules can reside in readily available storage media in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method. To avoid repetition, a detailed description is not provided here.

[0122] Those skilled in the art will recognize that the units, i.e., algorithm steps, of the various examples described in connection with this embodiment can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0123] The above embodiments provide a method and system for correcting the PY curve of large-diameter pile foundations in sandy soil, which can be implemented and has broad application prospects.

[0124] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A method for correcting the PY curve of large-diameter pile foundations in sandy soil, characterized in that, include: The sandy soil foundation is divided into several sub-soil layers. Based on geological exploration, the internal friction angle of the sand, the effective unit weight of the soil, and the vertical depth from the mud surface at the middle height of each sub-soil layer are obtained. The first, second, and third coefficients are calculated based on the obtained internal friction angle and the expression in the API specification PY curve method. Based on the effective unit weight of the soil, the first coefficient, the second coefficient, the third coefficient, and the vertical depth, the standard value of the ultimate horizontal soil resistance per unit pile length in each subdivided soil layer is obtained, specifically using the following formula: Where C1 is the first coefficient, C2 is the second coefficient, and C3 is the third coefficient. Effective land density; Based on the load characteristics and the preset number of cycles, a correction coefficient is determined, and the initial modulus of the foundation reaction force is calculated based on the internal friction angle. The correction coefficient is specifically expressed as follows: Where z is the vertical depth, D is the pile diameter, and N is the number of cycles; The initial modulus of the foundation reaction force is calculated based on the internal friction angle using the following formula: in, It is the internal friction angle; Based on the standard value of the ultimate horizontal soil resistance, the correction factor, and the initial modulus of the foundation reaction, the corrected PY curves of each subdivided soil layer are obtained, specifically using the following formula: in, For correction factor, This represents the standard value of the ultimate horizontal soil resistance. y represents the initial modulus of the foundation reaction force, and z represents the horizontal deflection of the pile at the current depth z calculation point. Based on the obtained PY curve and finite element simulation analysis software, deformation analysis of horizontal bearing piles is realized.

2. The method for correcting the PY curve of large-diameter pile foundations in sandy soil as described in claim 1, characterized in that, The deformation analysis of the horizontal bearing pile is realized based on the obtained PY curve and finite element simulation analysis software. Specifically, based on the obtained PY curve, finite element analysis software is used to analyze and obtain the pile deflection at each depth after a horizontal load is applied to the pile top.

3. A PY curve correction system for large-diameter pile foundations in sandy soil using the method described in claim 1, characterized in that, include: The data acquisition unit is used to divide the sandy soil foundation into several sub-soil layers and obtain the internal friction angle of the sand, the effective unit weight of the soil, and the vertical depth from the mud surface at the middle height of each sub-soil layer based on geological exploration. The coefficient calculation unit is used to calculate the first, second, and third coefficients based on the obtained internal friction angle and the expression in the API specification PY curve method. The ultimate horizontal soil resistance standard value acquisition unit is used to obtain the ultimate horizontal soil resistance standard value per unit pile length in each subdivided soil layer based on the effective unit weight of the soil, the first coefficient, the second coefficient, the third coefficient, and the vertical depth. The foundation reaction initial modulus calculation unit is used to determine the correction coefficient based on the load characteristics and the preset number of cycles, and to calculate the foundation reaction initial modulus based on the internal friction angle. The PY curve calculation unit is used to obtain the corrected PY curves of each subdivided soil layer based on the standard value of the ultimate horizontal soil resistance, the correction coefficient, and the initial modulus of the foundation reaction. The deformation analysis unit is used to perform deformation analysis on horizontal bearing piles based on the obtained PY curves and finite element simulation analysis software.

4. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and running thereon, characterized in that, When the processor executes the program, it implements the PY curve correction method for large-diameter pile foundations in sand as described in any one of claims 1-2.

5. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by the processor, the program implements the PY curve correction method for large-diameter pile foundations in sand as described in any one of claims 1-2.

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